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Other non-operating income (expenses), net
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Other non-operating income (expenses), net
8.
Other
non-operating
income (expenses), net
 
   
2017
   
2018
   
2019
 
   
NT$000
   
NT$000
   
NT$000
 
Interest income
      
Bank deposits
   53,123    49,051    59,901 
Financial assets at amortized cost
   —      920    4,467 
Foreign exchange gains (losses), net
   (418,970)    93,104    (154,993) 
Gain on valuation of financial assets at fair value through profit or loss
   637    1,485    1,317 
Rental income
   11,075    7,819    9,249 
Dividend income
   —      571    585 
Reimbursement of ADSs service charge
   23,707    13,269    4,292 
Grant income
   —      —      925 
Others
   2,808    6,851    970 
  
 
 
   
 
 
   
 
 
 
  
 
(327,620
) 
  
 
173,070
 
  
 
(73,287
)